Air and Water Pollution and their Control, Class 12 Biology Sample Papers

1. There will be total 10 MCQ in this test. 2. Please keep a pen and paper ready for rough work but keep your books away. 3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number. 4. No negative marking for incorrect choice. 5. Please click on “Finish the Test” when you want to exit. 6. All the best – Happy Studying.

1. In a polluted environment, the concentration of pollutant would be maximum in

Primary consumers

Tertiary consumers

Producers

Secondary consumers

Question 1 of 10

2. The pH of acid rain is below

4.6

6.5

6

7

Question 2 of 10

3. A common indicator organism of water pollution is

Lemna paucicostata

Escherichia coli

Entamoeba histolytica

Eichhornia crassipes

Question 3 of 10

4. Nutrient enrichment of water bodies causes

Stratification

Succession

Eutrophication

None of the above

Question 4 of 10

5. Thermal pollution results in

Death of aquatic animals

All of the above

Increase in the temperature of water bodies

Depletion of O2

Question 5 of 10

6. Photochemical smog is caused by a light-mediated reaction between

SO2 and O3

SO2 and unburnt hydrocarbons

NO2 and O3

NO2 and unsaturated hydrocarbons

Question 6 of 10

7. The term biomagnification refers to the

Growth of organisms due to food consumption

Blowing up of environmental issues by man

Increase in the concentration of non-degradable pollutants as they pass through the food chain

Increase in population size

Question 7 of 10

8. A lake with an inflow of domestic sewage rich in organic waste may result in

An increased production of fish due to plenty of nutrients

Increased population of aquatic food web organisms

Death of fish due to lack of oxygen

Drying of the lake very soon due to algal bloom

Question 8 of 10

9. Which of the following is a secondary pollutant?

NO

SO2

PAN

NO2

Question 9 of 10

10. The loudness of sound which a person can withstand without discomfort is about